What causes the outward gas pressure that balances the inward pull of gravity in a main-sequence star?
a. the rapid outward flow of gas
b. the rapid inward flow of the gas
c. the high temperature of the gas
d. the high density of the gas
e. the high temperature and the high density of the gas
e
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If several balls are thrown straight up with different initial speeds, the quantity that will have the same value along their paths is their
A) initial momentum. B) maximum height. C) time of travel. D) acceleration. E) none of the above
The basic function of the electric generator is which of the following conversion processes?
a. mechanical energy to electrical b. electrical energy to mechanical c. low voltage to high or vice versa d. alternating current to direct
When an air mass passes from a maritime source region to a warmer continental region, heating from the warmer land causes
A) frontal lifting. B) orographic lifting. C) convectional lifting. D) adiabatic lifting.
A space probe approaches a planet, taking measurements as it goes
If it detects a potential difference of 6000 MV between the altitudes of 253,000 km and 276,000 km above the planet's surface, what is the approximate electric field strength produced by the planet at 264,500 km above the surface? Assume the electric field strength is approximately constant at these altitudes. A) 261 N/C B) 0.261 N/C C) 561 N/C D) 493 ?N/C